Title: Process for improving the elongation of grain refined copper base alloys containing zinc and aluminum

Abstract: A process for improving the elongation of copper base alloys containing about 2 to 4.5% aluminum, 15 to 31% zinc, and a grain refining element such as iron, chromium, zirconium, or cobalt, is carried out through controlled grain coarsening. Such alloys are subjected to a cold reduction of about 15 to 40%, an intermediate anneal at about 625.degree. to 725.degree.C., a final cold reduction of 12 to 45% and a final anneal at about 600.degree. to 725.degree.C. Alternatively, the above sequence may be preceded by a preliminary cold reduction of about 10 to 70% and then a preliminary low temperature anneal at about 400.degree. to 600.degree.C. followed by the above reductions and anneals.

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Other info:

Inventors: Shapiro, Eugene (Hamden, CT, US)
Crane, Jacob (Woodbridge, CT, US)

Application Number: 576690
Filing Date: 1975-05-12
Publication_date: 1976-03-02
Assignee: Olin Corporation (New Haven, CT)
Primary Class(es): 148/684 148/434
Other Classes:
US Patent Ref:

3788902	Jan, 1974	Shapiro et al.	148/11.
3816187	Jun, 1974	Smith et al.	148/11.
3841921	Oct, 1974	Shapiro et al.	148/11.
3852121	Dec, 1974	Crane et al.	148/11.
3882712	May, 1975	Shapiro et al.	148/11.

Other Refs:
Primary Examiner: Stallard, W.
Assistant Examiner:
Attorney: Bachman; Robert H., Jackson; David A.